I think 10 days is beyond adequate. You've posted your "bruce" photo, and the rules state "In the even no official tag claim is made within 12 hours, the person with the 1st "bruced" photo gets the tag and the honor of choosing the next Tag mascot."
I say you choose a new mascot and haul it out to the TAT.
If Eggy turns up, we'll just cross that bridge when we get there. Maybe he's tired of being on the road and hitched a ride in a VW with a college gal heading home for the summer.